Beginner Guide
Peptide Reconstitution Basics
Peptide reconstitution involves adding a measured amount of liquid, commonly bacteriostatic water, to a dry vial so the resulting concentration can be understood as a liquid solution. BACToBasics focuses on the math behind concentration, volume, and syringe-unit conversions.
What is BAC water?
BAC water, short for bacteriostatic water, is sterile water that contains a preservative. It is commonly discussed in reconstitution contexts involving multi-dose vials.
What does reconstitution mean?
Reconstitution means adding a measured amount of liquid to a dry vial. Once liquid is added, the vial has a concentration that describes how much of the original substance is present in each mL.
Understanding concentration
Concentration is the amount present per unit of liquid volume. For example, if a 10mg vial is mixed with 2mL of liquid, the resulting concentration is 5mg per mL.
Understanding U-100 syringe units
A U-100 insulin syringe represents 100 volume markings per 1mL. This means 10 units corresponds to 0.1mL, 25 units to 0.25mL, and 50 units to 0.5mL.
mg vs mcg
Milligrams (mg) and micrograms (mcg) are different units of mass. 1mg equals 1,000mcg. A vial may be labeled in milligrams while smaller calculated amounts may be expressed in micrograms.
IU vs mg
Some compounds, including HCG, are commonly expressed in International Units (IU). IU describes substance-specific biological activity rather than simple mass, so it should not be treated as directly interchangeable with mg or mcg unless a specific conversion is established for that substance.
The basic reconstitution math
The core calculation is vial amount divided by liquid volume to determine concentration. An entered amount can then be divided by concentration to determine liquid volume, which can be converted into U-100 syringe units.
Peptide Reconstitution Math Example
As a simple math example, consider a 10mg vial combined with 2mL of liquid. The resulting concentration is 5mg per mL.
10mg ÷ 2mL = 5mg/mL
0.25mg ÷ 5mg/mL = 0.05mL
0.05mL × 100 = 5 U-100 units
This example demonstrates concentration and volume conversion math only. It is not a recommended amount or use protocol.
Peptide Reconstitution Calculators
Use the all-in-one peptide calculator for custom vial and liquid amounts, or open the dedicated BAC water calculator to compare how different bacteriostatic water volumes affect concentration, mL, and U-100 syringe units.
Peptide-Specific Calculators
12 popularOpen this list when you want to jump to a compound-specific calculator instead of scrolling past every option.
Peptide-Specific Calculators
12 popularOpen this list when you want to jump to a compound-specific calculator instead of scrolling past every option.
Peptide Reconstitution FAQ
Tap a question to reveal the answer without expanding the whole FAQ at once.
What does peptide reconstitution mean?
Reconstitution means adding a measured amount of liquid to a dry vial so the contents form a solution with a known concentration. BACToBasics focuses on the math used to understand that concentration.
What is bacteriostatic water?
Bacteriostatic water is sterile water containing a preservative. It is commonly discussed in reconstitution contexts involving multi-dose vials.
How do you calculate peptide concentration?
For basic reconstitution math, divide the amount in the vial by the volume of liquid added. For example, a 10mg vial mixed with 2mL produces a concentration of 5mg per mL.
How many U-100 syringe units are in 1mL?
A U-100 insulin syringe represents 100 units per 1mL. Therefore, 10 units corresponds to 0.1mL, 25 units to 0.25mL, and 50 units to 0.5mL.
What is the difference between mg and mcg?
One milligram equals 1,000 micrograms. Peptide vials may be labeled in milligrams while smaller calculated amounts may be expressed in micrograms.
BACToBasics provides educational math tools only. This content is not medical advice, dosing advice, injection instruction, or a recommendation to use any peptide or medication.